From mboxrd@z Thu Jan 1 00:00:00 1970 From: Samuel Thibault Subject: Re: [RFC] PVFB: Add refresh period to XenStore parameters? Date: Tue, 4 Mar 2008 17:19:13 +0000 Message-ID: <20080304171913.GA11444@implementation.uk.xensource.com> References: <20080229120806.GA8268@implementation.uk.xensource.com> <873ar7ptvh.fsf@pike.pond.sub.org> <20080303191804.GA11699@implementation.uk.xensource.com> <873ar68spy.fsf@pike.pond.sub.org> <20080304144952.GA9230@implementation.uk.xensource.com> <873ar67anv.fsf@pike.pond.sub.org> <20080304161220.GA9852@implementation.uk.xensource.com> <87tzjm5sh9.fsf@pike.pond.sub.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Return-path: Content-Disposition: inline In-Reply-To: <87tzjm5sh9.fsf@pike.pond.sub.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Markus Armbruster Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Markus Armbruster, le Tue 04 Mar 2008 18:06:26 +0100, a écrit : > Samuel Thibault writes: > > Markus Armbruster, le Tue 04 Mar 2008 16:48:20 +0100, a écrit : > >> * The domU writes to a framebuffer provided by the frontend. > >> > >> * The framebuffer (not a copy of it) can be shared with the backend, > >> which only reads. > > > > Well, that's not always the case, when the guest is in text mode for > > instance, the PV shared buffer is converted from the guest text buffer. > > Optimize for the common case. Which I figure is a 32 bpp framebuffer. Cirrus VGA is 24bpp max :) > Anyway, compare and copy for some legacy 80x25 text mode shouldn't eat > that much CPU. Yes. By my "that's not always the case", I actually expressed the need for the offset feature. Samuel